AIO_INIT(3)



AIO_INIT(3)                Linux Programmer's Manual               AIO_INIT(3)

NAME
       aio_init - asynchronous I/O initialization

SYNOPSIS
       #define _GNU_SOURCE         /* See feature_test_macros(7) */
       #include <aio.h>

       void aio_init(const struct aioinit *init);

       Link with -lrt.

DESCRIPTION
       The  GNU-specific aio_init() function allows the caller to provide tun-
       ing hints to the glibc POSIX AIO implementation.  Use of this  function
       is  optional,  but  to be effective, it must be called before employing
       any other functions in the POSIX AIO API.

       The tuning information is provided in the buffer pointed to by the  ar-
       gument init.  This buffer is a structure of the following form:

           struct aioinit {
               int aio_threads;    /* Maximum number of threads */
               int aio_num;        /* Number of expected simultaneous
                                      requests */
               int aio_locks;      /* Not used */
               int aio_usedba;     /* Not used */
               int aio_debug;      /* Not used */
               int aio_numusers;   /* Not used */
               int aio_idle_time;  /* Number of seconds before idle thread
                                      terminates (since glibc 2.2) */
               int aio_reserved;
           };

       The following fields are used in the aioinit structure:

       aio_threads
              This  field  specifies the maximum number of worker threads that
              may be used by the implementation.  If the number of outstanding
              I/O  operations  exceeds this limit, then excess operations will
              be queued until a worker thread becomes free.  If this field  is
              specified  with  a  value less than 1, the value 1 is used.  The
              default value is 20.

       aio_num
              This field should specify the maximum number of simultaneous I/O
              requests  that  the  caller expects to enqueue.  If a value less
              than 32 is specified for this field, it is  rounded  up  to  32.
              The default value is 64.

       aio_idle_time
              This field specifies the amount of time in seconds that a worker
              thread should wait for further requests before terminating,  af-
              ter  having  completed a previous request.  The default value is
              1.

VERSIONS
       The aio_init() function is available since glibc 2.1.

CONFORMING TO
       This function is a GNU extension.

SEE ALSO
       aio(7)

COLOPHON
       This page is part of release 5.07 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       https://www.kernel.org/doc/man-pages/.

Linux                             2020-04-11                       AIO_INIT(3)

Man(1) output converted with man2html
list of all man pages